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Multiplicatively Periodic Rings, Ted Chinburg, Melvin Henriksen
Multiplicatively Periodic Rings, Ted Chinburg, Melvin Henriksen
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We prove a generalization of Luh's result without using Dirichlet's Theorem. We then use Theorem 1 to show that the J-subrings of a periodic ring form a lattice with respect to join and intersection (the join of two subrings is the smallest subring containing both of them). After noting that every J-ring has nonzero characteristic, we determine for which positive integers n and m there exist J-rings of period n and characteristic m. This generalizes a problem posed by G. Wene.